diff --git a/taskcluster/ci/signing/kind.yml b/taskcluster/ci/signing/kind.yml
index 9a11e69b2..b1219bbca 100644
--- a/taskcluster/ci/signing/kind.yml
+++ b/taskcluster/ci/signing/kind.yml
@@ -54,6 +54,12 @@ job-template:
                         '3': production-signing
                         default: dep-signing
                 default: dep-signing
+    signing-format:
+      by-build-type:
+          # Fennec nightly cannot have the sha256 checksums. For more details, see
+          # https://github.com/mozilla-releng/scriptworker-scripts/pull/102#issue-349016967
+          fennec-nightly: autograph_apk_fennec_sha1
+          default: autograph_apk
     index:
         by-build-type:
             (fennec-.+|nightly|performance-test|beta|production):
diff --git a/taskcluster/fenix_taskgraph/transforms/signing.py b/taskcluster/fenix_taskgraph/transforms/signing.py
index 82ece300c..e0c6fb61d 100644
--- a/taskcluster/fenix_taskgraph/transforms/signing.py
+++ b/taskcluster/fenix_taskgraph/transforms/signing.py
@@ -18,7 +18,7 @@ transforms = TransformSequence()
 @transforms.add
 def resolve_keys(config, tasks):
     for task in tasks:
-        for key in ("index", "worker-type", "worker.signing-type"):
+        for key in ("index", "worker-type", "worker.signing-type", "signing-format"):
             resolve_keyed_by(
                 task,
                 key,
@@ -41,6 +41,7 @@ def set_signing_attributes(config, tasks):
 @transforms.add
 def set_signing_format(config, tasks):
     for task in tasks:
+        signing_format = task.pop("signing-format")
         for upstream_artifact in task["worker"]["upstream-artifacts"]:
-            upstream_artifact["formats"] = ["autograph_apk"]
+            upstream_artifact["formats"] = [signing_format]
         yield task